Ship OT Network Segmentation: Separating Crew Internet from Control Systems
Updated
A vessel network-segmentation project should start with an inventory of devices and required data flows. Crew internet, business systems and machinery networks have different operational risks. Separate them through an engineered arrangement while preserving authorised interfaces; simply adding a new router or Wi-Fi network does not demonstrate effective separation.
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Key takeaways
- Device and data-flow inventory
- System-owner and maker constraints
- Approved separation and access design
- Functional verification and controlled diagrams
Map operational dependencies
Identify equipment owners, network connections and necessary communication paths. Include supplier access, monitoring links and shared infrastructure. An undocumented connection can create both a security exposure and a commissioning surprise. The assessment should distinguish operational technology from ordinary office devices without assuming that every isolated-looking cabinet is actually disconnected.
Design controlled connectivity
The responsible network and system specialists should define permitted traffic, management access and failure behaviour. Coordinate with equipment manufacturers where restrictions or supported configurations apply. Do not treat live scanning or configuration changes as harmless discovery activities. The vessel must authorise work that could disturb operational communications.
Test security and operation together
Acceptance should show that required functions remain available and unauthorised paths are restricted as designed. Record the configuration, asset inventory and recovery process. Assign ownership for later changes, otherwise a future connectivity installation can undo the original separation. Network diagrams should remain controlled vessel records rather than contractor-only sketches.
Illustrative procurement scenario
A crew Wi-Fi expansion proposes using an existing switch that also carries machinery data. The project identifies that shared boundary and scopes a controlled alternative. The owner avoids judging the installation solely by improved internet coverage while overlooking a new connection into operational systems.
Sea Clean electrical work and personnel enquiries
Sea Clean supplies electricians for vessel installation, repair and project support, with electrical personnel hire and technical crewing enquiries also welcome. The proposal defines the work, competence, supervision and any required specialist or approved-provider involvement. Attendance, personnel availability and commercial terms are stated for the specific assignment.
For this enquiry, include: Current topology, device owners, required data flows, planned connectivity changes, support interfaces and approved work windows.
Related work packages and enquiry preparation: Electrical installation, communications and technical personnel guides
Frequently asked questions
Does a separate Wi-Fi name prove network isolation?
No. Names describe wireless networks, not the complete routing, switching and access-control arrangement behind them.
Sources
- IMO — maritime cyber risk — Risk management and safety-management context; review the current linked guidance.
- Netsphere Marine — satellite and onboard connectivity scope — Commercial scope reference; model requirements and service-plan eligibility must come from the selected provider.
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- Ship HMI Replacement: Screens, Configuration and Control Access
- Vessel Sensor Loops: Finding the Difference Between Measurement and Indication
- Ship Alarm and Monitoring Upgrades: Scope, Priorities and Verification
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Current topology, device owners, required data flows, planned connectivity changes, support interfaces and approved work windows.
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